Paul Reece Huffman

Test of parity-conserving time-reversal invariance using polarized neutrons and nuclear spin aligned holmium.

A test of parity-conserving, time-reversal noninvariance (PC TRNI) has been performed in 5.9 MeV polarized neutron transmission through nuclear spin aligned holmium. The experiment searches for the T-violating fivefold correlation via a double modulation technique{emdash}flipping the neutron spin while rotating the alignment axis of the holmium. Relative cross sections for spin-up and spin-down neutrons are found to be equal to within 1.2{times}10{sup {minus}5} (80{percent} confidence). This is a two orders of magnitude improvement compared to traditional detailed balance studies of time reversal, and represents the most precise test of PC TRNI in a dynamical process, to our knowledge. {copyright} {ital 1997} {ital The American Physical Society}

The deformation effect and time-reversal violation in neutron resonances

We describe how the deformation effect in nuclear spin aligned can be used to identify small d-wave admixtures in predominantly s-wave resonances. Using standard angular momentum penetrabilities, we estimate deformation effect cross sections for resonances below 500 eV. If d-wave admixtures are identified in a number of s-wave resonances, then a test for a parity-conserving, time-reversal violating term in the neutron-nucleus forward scattering amplitude is possible.

Measurements of the total cross section for the scattering of polarized neutrons from polarized {sup 3}He

Measurements of polarized-neutron--polarized

The scattering of polarized neutrons from statically polarized solid 3He

{\mathrm{\ensuremath{-}}}^{3}

Measurements at Low Energies of the Polarization-Transfer Coefficient

He scattering are reported. The target consisted of cryogenically polarized solid

An experimental test of parity‐even time reversal invariance with MeV neutrons

^{3}\mathrm{He}

A polarized solid 3He target for neutron transmission experiments

, with thickness 0.04 atom/b and polarization \ensuremath{\sim}0.4. Polarized neutrons were produced via the

Testing P‐even time reversal invariance with MeV neutrons

^{3}\mathrm{H}

Measurement of the polarized neutron—polarized 3He total cross section

(p\ensuremath{\rightarrow},n\ensuremath{\rightarrow}

A statically polarized solid 3He Target

{)}^{3}